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2009 Kenworth T660 break issues

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Al75, Dec 14, 2016.

  1. Dec 14, 2016 #1
    Al75

    Al75 Bobtail Member

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    Dec 14, 2016
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    2009 Kenworth T660 , unusual case im having here , no matter if im driving high speed low speed parked , when the air tanks need to be filled up to 120 psi my front breaks come on by themselfs without me pushing the peddal and it lasts about 40 seconds and then They release themselfs . Not sure whatto do i replaced the pedal valve. Help please !!
     
    Al75, Dec 14, 2016
    Al75, Dec 14, 2016
    #1
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  3. Dec 14, 2016 #2
    boneebone

    boneebone Road Train Member

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    Most likely it's the Foot Brake Valve.
     
    boneebone, Dec 14, 2016
    boneebone, Dec 14, 2016
    #2
    Al75 Thanks this.
  4. Dec 14, 2016 #3
    Al75

    Al75 Bobtail Member

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    Dec 14, 2016
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    I replaced it , thats not it .
     
    Al75, Dec 14, 2016
    Al75, Dec 14, 2016
    #3
  5. Dec 14, 2016 #4
    boneebone

    boneebone Road Train Member

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    Check the Tractor Protection Valve.
     
    boneebone, Dec 14, 2016
    boneebone, Dec 14, 2016
    #4
    BoxCarKidd Thanks this.
  7. Dec 14, 2016 #5
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Is there a quick release valve for the steer axle with with an extra line to it? Block it off to test. If it works leads you to a problem coming from that line. Just throwing darts but if that does not work I have another one or two. The other 3 lines are one to each wheel a one connected to the foot valve.
     
    BoxCarKidd, Dec 14, 2016
    BoxCarKidd, Dec 14, 2016
    #5
  8. Dec 14, 2016 #6
    Al75

    Al75 Bobtail Member

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    Thank you i will check it out tomorrow once i get back to my truck and let you know what happens . Praying that your advice might solve the issue.
     
    Al75, Dec 14, 2016
    Al75, Dec 14, 2016
    #6
  9. Dec 14, 2016 #7
    BoxCarKidd

    BoxCarKidd Road Train Member

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    He said front so I assume that's steer axle. Connection to TPV?
     
    BoxCarKidd, Dec 14, 2016
    BoxCarKidd, Dec 14, 2016
    #7
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